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For according to the arguments from the sciencesScientific knowledge must have a permanent object (cf. Aristot. Met. 1.4.2. there will be Forms of all things of which there are sciencesIncluding artificial products; cf. Aristot. Met. 1.15.; and according to the One-over-Many argument,The fact that several particulars can have a common quality or nature implies a single Idea of which they all partake (Plat. Rep. 596a). of negations too; and according to the argument that we have some conception of what has perished, of perishable things; because we have a mental picture of these things.The theory always admitted Ideas of perishable things, e.g. man. The objection here is that if the memory of dead men establishes the Idea of man, the memory of a dead individual establishes an Idea of that (perishable) individual. Again, of Plato’s more exact arguments some establish Ideas of relations,Plat. Phaedo 74a-77a, Plat. Rep. 479a-480a. which we do not hold to form a separate genus;
